1. Salt compresses should not be used when mouth ulcers are present. Mouth ulcers need to be treated with the correct medication including gargles, dispersions and so on. 2. When mouth ulcers appear, you can not use salt compresses, salt will stimulate the wound, resulting in pain, and even prone to secondary infection. 3. If mouth ulcers occur, you can use gargles, such as chlorhexidine gargle, ciprofloxacin or povidone-iodine. You can also use oral ulcer powder, ice boron powder and other drugs, can help the wound healing. Normally, you need to pay attention to a light diet, avoid irritating food, etc.. If the symptoms of mouth ulcers are serious, you should go to the hospital in time for examination, and the use of the above drugs should follow the doctor’s instructions.